This is very easy baked pasta dish that I have adapted from the back of a Barilla box. It makes a very hearty first course or can be the main dish for a vegetarian meal.
Drain and rinse with cool water to prevent sticking.
Spread 1 cup marinara sauce in 13" x 17" glass baking dish.
In large bowl, combine ricotta, 1 1/2 cups mozzarella, and 1/2 cup of parmesan. Add nutmeg, season with salt and pepper. Fill each cooked shell with equal ricotta mixture.
Arrange filled shells open side up in baking dish, top with remaining marinara sauce, then sprinkle remaining mozzarella and parmesan cheeses.
Bake covered with foil until bubbly about 30 min. Uncover and cook until cheese is melted, about 5 min.
Remove shells from oven, top with fresh basil, cool 5 minutes before serving.